Dynamics of the 5 eV optical absorption in SiO2glass

摘要

The optical absorption at 5 eV in SiO2glass was observed, using laser calorimetry, to change reversibly depending on the intensity of UV light. The generation and bleaching of an absorption band at 5 eV by twohyphen; and onehyphen;photon absorption processes, respectively, can explain these reversible changes. This observation supports the structural model of unrelaxed oxygen deficiency center for the 5 eV absorption band in silica.